Dennis Skinner urged ministers to stand up to the US President as he likened the Republican to a “fascist”.
The firebrand MP delivered the damming assessment during an urgent Commons statement from the Foreign Secretary.
Boris Johnson and the Government came under fire from politicians over Mr Trump's proposed state visit to Britain.
Dennis Skinner compared Donald Trump to Adolf Hitler on Monday
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Now this Government are hand-in-hand with another fascist – Trump
Mr Skinner blasted the visit as he said the 45th US President was not fit for the honour of addressing Parliament in Westminster Hall as Nelson Mandela did in 2003.
As Mr Johnson argued comparisons with Europe in the 1930s “trivialised the holocaust” – Mr Skinner launched a scathing attack on Theresa May’s Government.
Speaking in the Commons, he likened Mr Trump’s new policy as something from the Hitler era.
The Labour MP was speaking during an urgent statement in the Commons
He said: “Will the Foreign Secretary just for a moment try to recall, along with me, as I hid underneath the stairs when two fascist dictators, Mussolini and Hitler, were raining bombs on towns and cities in Britain.
"Now this Government are hand-in-hand with another fascist – Trump.
"And what I say to him – do the decent thing and ban the visit. This man is not fit to walk in the footsteps of Nelson Mandela."
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Boris Johnson hit back at the comments made by Dennis Skinner
The Foreign Secretary hit back at the comments, dismissing the comparison as he insisted it was in Britain’s interests to work with Donald Trump.
“I hesitate to say it but your memory must be at fault if you think Mussolini rained bombs on this country,” he said.
"But I hear the comparison that he makes, I don't accept that comparison.
"I believe it's in our interests to work with our American friends and partners to show our disquiet where that is appropriate and to get the best deal for UK nationals and dual nationals."
Protests have been taking place in the UK against Donald Trump
Protests have been taking place across the UK on Monday evening in backlash to the temporary US’ travel ban against citizens from Iraq, Iran, Libya, Somalia, Sudan, Syria and Yemen entering the country.
Thousands have taken to the streets in London, Manchester, Glasgow and about 30 other cities and towns.
A petition calling for the prime minister to cancel Mr Trump’s planned state visit to the UK has been signed more than 1.4 million times.
Downing Street has rejected the criticism, a spokesman said: “The USA is one of this country's closest allies, and we look forward to hosting the president later this year."
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